[Pixman] FAST_PATH_SAMPLES_COVER_CLIP flag & fast_composite_scaled_nearest_*

[Soeren Sandmann]

Soeren Sandmann <sandmann at daimi.au.dk> writes:

> Instead, I think both issues can be fixed by using a new function:
> 
>         compute_sample_bounds (transform, box, filter)
> 
> that would do the rounded transformation on each of the four corner
> pixels, adding the filter extents, and then compute the bounding box
> of that instead. Does that seem like a reasonable plan?

Here is an attempt at doing this.

Soren